ALSA: hda - Flush the pending probe work at remove

commit 991f86d7ae4e1f8c15806e62f97af519e3cdd860 upstream.

As HD-audio driver does deferred probe internally via workqueue, the
driver might go into the mixed state doing both probe and remove when
the module gets unloaded during the probe work.  This eventually
triggers an Oops, unsurprisingly.

For avoiding this race, we just need to flush the pending probe work
explicitly before actually starting the resource release.

Bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=960710
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 3b36582970702219f0e1b28f16093b4de6425b48..614baff1f5d7a915bd429405193c06b57f56548f 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2126,9 +2126,17 @@ i915_power_fail:
 static void azx_remove(struct pci_dev *pci)
 {
        struct snd_card *card = pci_get_drvdata(pci);
+       struct azx *chip;
+       struct hda_intel *hda;
+
+       if (card) {
+               /* flush the pending probing work */
+               chip = card->private_data;
+               hda = container_of(chip, struct hda_intel, chip);
+               flush_work(&hda->probe_work);
 
-       if (card)
                snd_card_free(card);
+       }
 }
 
 static void azx_shutdown(struct pci_dev *pci)